Normally macroeconomic policy, such as stimulus packages, are passed by the legislature incrementally, not just in one instance, so unfortunately, I would expect more of these measures in the near future.
And just to quickly expand on your original point of Australia's different economic situation. When the first phase of our economic stimulus plan was passed in late 2008, the budget was in surplus, and there was no Federal debt. Even with all these measures being passed, around $77 billion in total, debt as a percentage of GDP, won't exceed 10%, which is well below other advanced economies.
In any case, the economic stimulus has kept unemployment somewhat stable, and there has been stable economic growth. So I support the government taking an more interventionist role in the economy. However, if living in the US, I would be skeptical about the same measures being passed, considering the level of debt and the large defect.